Drawing-press.



4PATEISTED MAY 26, 1908.

L. G. SHARP. DRAWING PRESS.

ArPLxoATIoN 311.31) 13110.13, 190e.

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No. 889,155. EATBNTED MAY 26, 1902:.y

' L. G. SHARP.

DRAWING PRESS.

APPLIOATION FILED DEG. 13, 1906.

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gle links 9 and 10.

LEE C. SHARP, OF OMAHA, NEBRASKA.

DRAWING-PRESS.

Specicaton of Letters Patent.

Patented May 26, 1908.

Application filed December 13, 1906. Serial No. 347,633.

To all whom it may concern.'

Be it known that I, LEE C. SHARP, a citizen of the United States, residing in Omaha, in the county of Douglas and State of Nebraska, have invented a new and useful 1mprovement in Drawing-Presses, of which the following is a specification.

My invention relates to drawing presses and it is the object thereof to provide a machine of this class suitable for drawing cup forms from sheets of metal, straw board and the like, in which the plates to be drawn may be fed automatically between the drawing and clamping plates in which the sheets may be clamped between the drawing and clamping plates with a constant pressure either yielding or positive; in which the drawing and clamping plates may be heated to a temperature suitable to facilitate the drawing operation, in which the drawing plate may be readily removed from the press without loosening of bolts or screws and in which the frame and operative mechanism is of a single and durable construction.

My invention consists in the construction and arrangement of the various devicesfor accomplishing the foregoing objects and in certain other minor details of construction and operation as will be more fully described and claimed hereinafter.

1n the accompanying drawings 1 have illustrated a drawing press embodying my invention in which Figure 1 is a longitudinal sectional elevation thereof. Fig. 2 is a plan view of the same, partly in section on a horizontal plane passing through the center of the draw plunger. Fig. 3 is a detail section on line -r of Fig. 1. Fig. 4 is a similar view on line g/-fy of Fig. 1. Fig. 5 is a detail section on line z-z of Fig. 3. Fig. 6 is a detail plan view of the automatic feeding mechanism. Fig. 7 is a section on line p-p of Fig. 6, and Fig. 8 is a detail side elevation of the lower portion of the feed runway and deflecting plate.

1n the construction shown I employ a suitable base 1 upon which is secured an integral frame comprising the side plates 2, the end plate 3, and the cross bars 4 and 5. AA crank shaft 6, driven from the ily wheel A, is journaled on suitable bearings on the side plates 2, and to the crank 7 of said shaft is connected the rod 8 extending upwardly to the tog- The link 9 is pivoted on the pin 11 passing through the side plates 2 adjacent to the cross bar 5. The linklOY is connected to the cross-head 12 by a pin 13 extending through said cross-head. The extent of movement of the toggle links is shown in dotted lines in Fig. 1. The cross-headis slidable horizontally in the guideways formed by the upper edges of the side plates 2 and the parallel bars 14 secured to the side plates by bolts 15 and separated therefrom by suitable spreader blocks as represented.

A draw plunger 53 is carried by the crosshead, `extending forward horizontally therefrom through the spring-case block 20 and the clamping and drawing plates. On the rear end of the draw plunger is a tapered stud 54 extending into a suitable recess in the cross-head and held therein by a pin 55, as shown in Fig. 1.

The draw-plate retainer block 16 is secured to the end plate 3 between the side plates 2 by bolts 17 passing through the front flange thereof 18 and into the end plate 3. Said retainer block is approximately U- shaped in section, ,as represented in Fig. 4, and to the rear flange thereof 19 the clamping plate spring-case block 20 is secured by bolts.

The clamping plate 25 'is' of the spring-case and extend forward alongy 'side the cross head guides as represented in Fig. 2. The clamping-plate is normally pressed toward the draw-plate with a constant pressure by the springs 29 around the studs 26 and the springs 30 within the pockets 31 in the spring case, as represented in Fig. 5. The tension ofthe springs 30 may be adjusted by means of the screws 32 passing through the front side of the spring-case and bearing against the plates 33 at the bottoms of the spring pockets 31. 1n the upper sides of the levers 27 are the cam grooves 34, the outer edges of which grooves are normally engaged by small rollers carried by the lugs 35 extending outwardly from the sides of the cross head 12. At the limit of the backward stroke of the cross head the said rollers engage the beveled faces 36 of the cam grooves and press the levers outward thereby pulling the clamping plate back away from the drawplate. 1f, by any reason, when the clamping through the curved slots 45.

plate has been pulled away from the drawplate, the springs 29 and 30 should fail to push the said plate back into engagement with the draw-plate the same will be positively pushed into position by the rollers on the lugs 35 engaging the beveled faces 37 of the cam grooves 34. By making the rollers on the lugs 35 of a diameter equal to the width of the cam grooves, so that the rollers will engage the inner faces of the grooves as well as the outer faces, the clamping plate may be positively pressed into engagement with the draw-plate instead of yieldingly engaging the same as is the case when the rollers are of a diameter smaller than the Width of the cam grooves. lt may be here noted that by the described manner of placing the levers for operating the clamping plate, viz., outside of the side plates or frame of the machine the said side plates may be brought closer together, thus making a stronger and more rigid construction.

Secured to the upper side of the springcase block 2O is the bracket 38 which, curving upwardly and rearwardly, forms the upper side thereof of the feed runway 39, and supports the feed table 40. Secured to the top of the feed table 40 are the sheet holding or magazine plates 41 and 42, the same being of the form and secured in the manner shown in Fig. 6. The curved plates 42, being pivotally held by the pins 43, may be swung outward by loosening the bolts 44 passing A weight 46 is held between the inner edges of the plates 42 and is vertically slidable in suitable grooves therein.

In the top and bottom of the table are formed the guide grooves 47 in which are slidably held the plates 48 and 49, which plates are connected by the screws 50 passing through the slot 51 in the table. The upper or feed plate 48 extends slightly above the surface of the table, as re resented in Fig. 7. The lower plate 49 is rigidlly connected to the strut 52 extending upwardly from the cross head 12.

ln operating the press a pile of the sheets to be drawn, X, is placed in the magazine formed by the plates 41 and 42, resting on the table top and the feed plate 48. As the cross head moves on its rearward stroke the lower sheet of the pile falls in front of the forward edge of the feed plate 48 so that on the forward stroke of the feed plate the said sheet will be engaged and pushed forward thereby. The lower edges of the plate 42 are cut away in front of the pile of blanks an amount sufficient to permit one of the sheets to pass below the same, as shown in Fig. 7 and by dotted lines in Fig. 6, while the rear lower edge of the weight 46 is beveled, as shown in Figs. 1 and 7 so that when a sheet engages the same it will be lifted an amount sufficient to permit the sheet to pass under the same.

Thus at each stroke of the cross-head a sheet will be displaced from the magazine and forced out upon the runway 39. The purpose of the Weight 46 is to hold the sheets down onto the feed plate until the final ejectment of the same from the magazine. The sheet emerging from the magazine onto the runway slides down the same, and strikes the deilecting plate 56. At the top of said plates the adjacent faces thereof are beveled, as shown in Fig. 1, so that on the rearward stroke of the cross-head when the clamping plate is drawn away from the draw plate the sheet will be guided by the said beveled faces and fall between the plates. On the front side of the clamping plate are the centering stop pins 57 shown in Fig. 5, on which the sheets falling between the plates rest, thereby bringing the same to a position concentric with the openings through the plates. rlhe said pins extend into slots in the draw-plate which slots are extended to the lower edge of the plate, as indicated by the dotted lines in Fig. 1, so that the pins will not interfere with the movement of the said plate in lifting the same from the retainer block. The deflecting plate 56 may be readily lifted from its retaining slots in the lugs 58 at the lower part of the bracket 38.

At each forward stroke of the draw plunger the sheet held between the clamping and draw plates is drawn into a cup form over the end of the plunger and carried thereby entirely through the draw plate into the space inclosed by the block 16. On the rearward stroke of the draw plunger the edge of the drawn cup engages the lip formed by the groove 59 in the front face of the collar 23 of the draw plate, and is stripped thereby from the plunger, thence falling through the opening 60 in the block 16 into any suitable receptacle placed below the same.

Passing around the lower portion of the spring-case is a perforated pipe 61, as represented in Fig. 6, and the same is connected to any suitable gaseous fuel supply. By this means the draw plate and clamping plate may be heated to a comparatively high temperature so that when a sheet is dropped between the same to be drawn it will become heated, thus facilitating the flow of material during the drawing operation.

lf desired, suitable dies may be secured to the end plate 3 in front of the draw plunger for embossing characters on the heads of the drawn cup-forms or for punching openings therein, such as the filling openings in the heads of two-part draw cans, such as described in my Patent No. 715,163.

This application is a renewal of my original application, Serial No. 208,238, filed April 15th, i904.

I claim l. In a press of the class described, a draw plate, a draw plunger, means for actuating yieldingly the plunger, and a retainer block for the draw plate in which the same is removably held in position by gravity and means for automatically feeding the sheets one by one into position between said plunger and draw late.

2. In a press of the class describe a draw plate, a draw plunger, actuating means for said lunger, a clamping plate, and means for yieldingly pressing the clamping plate toward tliedraw plate with a substantially constant pressure and means for automatically feeding the sheets one by one into position between said plunger and draw plate.

' 3. In a press of the class described, adraw plate, a draw plunger, actuating means for said plunger, a clamping plate, means for ressing the clamping plate toward the raw plate, and means for ositively moving the clamping plate away from the draw plate momentarily at a point in each cycle of movement of the draw plunger. 4. In a press for drawing cup-forms, a draw plate, a clamping late, a draw plunger adapted to pass throug the said plates and to carry the cups formed thereby entirely through the draw plate, means on the draw plate for engaging the drawn cups to strip the same from the plunger at the rearward stroke thereof, means normally pressing the clamping plate toward the draw plate, means for positively pulling the clampingV plate away from the draw plate at a predetermined point in the movement of the draw plunger, and means for automatically feeding a sheet between the draw plate and clamping plate at each movement of the latter plate away from the former. A

5. In a drawing press, a suitably disposed sheet-containing magazine, means for removing single sheets from said magazine, a-draw plate, a clamping plate, means normally ressiiig said plates toward each other, means for positively drawing said plates apart, and a runway for directing between said plates the sheets removed from the magazine.

6. In a drawing press, the combination with a sheet-containing magazine, and means for removing single sheets from said magazine, of a draw plate, a clamping plate,

'means for directing between the said plates sheets removed from the magazine, and means for heating the said plates.

7. In a drawing press, a draw plate, a

clamping plate, a draw plunger adapted to l pass through said plates, a cross h ead carrying said draw plunger, means for actuating said cross-head, means normally pressing the clamping pllate yieldingly toward the draw plate, side evers connected with said clam ing plate, and means connected with t e cross-head for actuating said levers to move the clamping plate away from or toward the draw late.

8. n a self-feeding draw press, a draw plate, a draw plunger, a clamping plate normally pressed yieldingly toward the draw plate, and means for ositively drawing` the clamping plate away rom the draw plate to admit a gravity feed sheet between the same.

9. In a mechanism of the class described, a sheet containing magazine adapted to contain a'plurality of sheets in a vertically disposed pile, a reciprocatable feed plate adapted to engage the outermost sheet of the pile, and to remove said sheet from the magazine, and means for holding said sheet in engagement with the plate until the final ej ectment thereof from the magazine, said means comprising a weight vertically reciprocatable and normally resting upon the feed plate. t

10. In a drawing press, a' draw plate, a draw plunger, a clamping plate, means normally pressing the clamping plate toward the draw plate with a constant ressure, and interchangeable means where y the said ressure may be made of a nature either yielding or positive.

11. In a self feeding drawing press, a draw plate, a clamping plate, a draw plunger adapted to pass through said plates, means operated synchronously with the draw plunger for feeding sheets between thesaid plates, and centering stop pins on one of said plates for alining and centering the sheets in relation to the opening therein through which the, draw plunger passes.

12. In a draw press, a draw plate, a draw plunger, a cross head carryinglsaid plunger, means for actuating said cross head a frame supporting lsaid cross head and actuating means, a clamping plate supported adjacent to the draw plate, side levers connected with said clamping plate and controlling the movement thereof said levers being positioned outside of the supporting frames, and means connected with the cross head for actuating said side levers.

LEE o. SHARP.

Witnesses:

H. M. MUNDAY, EDMUND Ancocir. 

